c# - 从派生类复制基类的内容

Question

我目前有一个派生类和一个基类。如何使派生类的基类等于我拥有的基类？浅拷贝有用吗？

class Base
{
    private string name; 
    public string Name { get; set; }
    private string address; 
    public string Address { get; set; }
}

class Derived:Base
{
    private string field; 
    public String field { get; set; }
}

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Base b = new Base();
            b.Address = "Iliff";
            b.Name = "somename"; 

            Derived d = new Derived();
            //How can I make the base class of d equal to b ?

        }
    }
}

Answer 1

为基类创建一个复制构造函数，这样做时您还需要创建一个无参数的构造函数，并且通过添加复制构造函数，编译器将不再生成默认构造函数。然后在派生类中调用基类的拷贝构造函数。

public class Base
{
    public int Name { get; set; }
    public string Address { get; set; }

    public Base()
    { }

    public Base(Base toCopy)
    {
        this.Name = toCopy.Name;
        this.Address = toCopy.Address;
    }
}

public class Derived : Base
{
    public String Field { get; set; }

    public Derived(Base toCopy)
        : base (toCopy)
    { }

    // if desired you'll need a parameterless constructor here too
    // so you can instantiate Derived w/o needing an instance of Base
    public Derived()
    { }
}